Please ignore history in discussions like this. the Knightly Code of Honor was a pleasant myth dreamed up by writers hundreds of years after "knights" even existed...and besides, this is not history, it is fantasy.
The core of this discussion is set between two choices; you either
a) believe that the paladin is an archetype in and of itself and that that archetype is based upon honor, loyalty, and goodness.
or
b) believe that a paladin is a holy champion of some type.
They are really very different animals and discussing the two in one thread is very hard.
On another note:
I am not saying anything noble about torture here but a neutral good character shouldn't have any qualms about it if it was for the greater good. Neutral Good is one of those alignments where the strictures of law and chaos just don't apply, it's whatever suites your fancy to get done what needs to be done for the greater good. It might not be noble to do certain things, but then again, is it noble to let thousands of people to die because of commiting an act that is viewed by 1/8 of the populace not noble or honorable or even correct.
The issue here is whether torture is a chaotic (ie more concerned with individuality) act or an evil (pursuing your own goals regardless of who is harmed) act. I would say it is evil. I would go so far as to say that any Ends Justifies the Means philosophy is more Neutral Evil than Neutral Good.
Especially in a fantasy game where there are truth spells and mind probes, using torture is not necessary, it is merely expedient and choosing expedience over a non-cruel slower course is not merely amoral, it is immoral.
On another note, people speak of neutrality as if it is a thing. It is not. It is the absence of a thing. To say that a neutral character believes something is false. They are identified by what they don't believe (except the "balance" theory of true neutral). A neutral good character is concerned only for the greater good and does not concern herself with tradtion, free will, honor, or change. A lawful neutral character is concerned with order and tradition but is unconcerned with good or evil.
In my opinion, in a nutshell,
Truth, tradition, honor = lawful
Free-will, change, cutting edge = chaotic
Preservation of life, helping others, compassion = good
Lack of concern for life, selfishness, cruelty = evil
In my mind, the paladin is a warrior who follows a tradition of pursuing the greatest good by the greatest means, never compromising honor for good or vice versa. This is lawful good.
Of course, I don't use the alignment system anymore so this whole argument is a little moot for me.
JMHO
DC